'Turn-ON' [5]helicene-based fluorescence sensor with very large Stokes shift for highly selective detection of Ag+ and AgNPs
| Autor: | Waraporn Panchan, Thanasat Sooksimuang, Anuwut Petdum, Nantanit Wanichacheva, Pattanawit Swanglap, Jitnapa Sirirak |
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| Rok vydání: | 2018 |
| Předmět: |
Metal ions in aqueous solution
02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Silver nanoparticle chemistry.chemical_compound symbols.namesake Stokes shift Materials Chemistry Electrical and Electronic Engineering Instrumentation Detection limit Aqueous solution Chemistry Metals and Alloys Nuclear magnetic resonance spectroscopy 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Helicene symbols 0210 nano-technology Selectivity |
| Zdroj: | Sensors and Actuators B: Chemical. 259:862-870 |
| ISSN: | 0925-4005 |
| Popis: | Novel Ag+ fluorescence sensor (HC4) based on 2-(4-(2-aminoethylsulfanyl) butylsulfanyl)ethanamine and [5]helicene dye, was successfully synthesized with high yield. The optical studies of HC4 showed the intense fluorescence signal and significantly large Stokes shift of 187 nm. The sensor exhibited high sensitivity and selectivity “turn-on” fluorescence response for Ag+ over competitive metal ions such as Cu2+, Hg2+, Pb2+, Ca2+, Cd2+, Co2+, Fe2+, Na+, K+, Ba2+, Al3+, Ni2+, Mn2+, Li+, Mg2+ and Zn2+ in aqueous methanol solution. The detection limit of HC4 for Ag+ was 10 ppb, which was lower than the recommended value for the U.S. EPA. NMR spectroscopy, Job’s plot, and molecular modeling indicated that sulfur atoms in HC4 played an important role in the selective binding to Ag+. The stoichiometry between HC4 and Ag+ was 1:1. In addition, HC4 could be applied for detection of silver nanoparticles (AgNPs) with simply one-step sample pretreatment, thus the sensor could be used for determining of AgNPs in the consumer products and environment. |
| Databáze: | OpenAIRE |
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